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Flashcards on Magnetic Field in Matter
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What is a magnetic field?
A region around a magnet or a current-carrying wire where the magnetic force can be detected.
What is the SI unit of magnetic field?
Tesla (T)
What happens to the magnetic field when a bar magnet is cut into two pieces?
Each piece still has its own magnetic field.
What is a ferromagnetic material?
A material that can be magnetized and retains its magnetism even when the external magnetic field is removed.
What is the Earth's magnetic field caused by?
The movement of molten iron in its outer core.
How can the direction of a magnetic field be determined?
By using a compass needle which aligns itself with the magnetic field lines.
What is the magnetic field inside a solenoid?
Strong and nearly uniform.
What is the relationship between current and the magnetic field produced by a wire?
The magnetic field is directly proportional to the current.
What is magnetic permeability?
The degree to which a material can be magnetized.
What is the Curie temperature of a ferromagnetic material?
The temperature above which it loses its ferromagnetic properties.
Why does a compass needle point north?
Due to the Earth's magnetic field.
What materials are attracted to a magnet?
Iron, nickel, and cobalt.
What is the direction of the magnetic field outside a magnet?
From the north pole to the south pole.
What is a magnetic domain?
A region within a material where the magnetic fields of atoms are aligned in the same direction.
What is the purpose of a magnetic shield?
To protect sensitive equipment from external magnetic fields.
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Test Your Knowledge
The SI unit of magnetic field is:
Ampere (A)
Ohm (Ω)
Tesla (T)
Hertz (Hz)
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What is a magnetic field?
A region around a magnet or a current-carrying wire where the magnetic force can be detected.
A region around an electric charge where the electric force can be detected.
A region around a light source where light can be detected.
A region around a sound source where sound can be detected.
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What causes the Earth's magnetic field?
The movement of air in the atmosphere.
The rotation of the Earth.
The movement of molten iron in its outer core.
The gravitational pull of the Moon.
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What is the direction of the magnetic field outside a magnet?
From south to north.
From north to south.
From east to west.
From west to east.
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Which materials are attracted to a magnet?
Plastic and wood.
Iron, nickel, and cobalt.
Aluminum and copper.
Glass and ceramic.
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What happens to the magnetic field when a bar magnet is cut into two pieces?
The magnetic field becomes weak.
Each piece still has its own magnetic field.
The magnetic field disappears.
The magnetic field reverses direction.
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What is the purpose of a magnetic shield?
To protect sensitive equipment from external magnetic fields.
To amplify external magnetic fields.
To create a strong magnetic field.
To block visible light.
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What is the magnetic field inside a solenoid?
Weak and non-uniform.
Strong and nearly uniform.
Depends on the current direction.
Zero.
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What is the relationship between current and the magnetic field produced by a wire?
The magnetic field is directly proportional to the current.
The magnetic field is inversely proportional to the current.
There is no relationship between current and magnetic field.
The magnetic field depends on the resistance of the wire.
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What is magnetic permeability?
The ability of a material to conduct electricity.
The ability of a material to reflect light.
The degree to which a material can be magnetized.
The ability of a material to withstand high temperatures.
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